Canon 40d won't turn on, LCD is blank.

Took 10 pics today then charged the battery and when I put it back in the camera won't turn on. I put another battery in from a 50d and still a no go. Is there a reset button somewhere on the camera? Thanks

There are several different things that can cause the camera to not start up. Refer to your user manual to check each of these items. If you don't have your user manual, you can download it here.

1) The battery is not properly installed in the camera. (p.26) 2) Make sure the battery compartment cover is closed. (p.26) 3) Make sure the CF card slot cover is closed. (p.28)

In addition, the battery may not have been properly recharged. Double check that the charger is plugged into a working outlet, and double check that it shows that the battery is fully charged.

If none of these fix the problem then you have a defective camera - one of the switches for the battery compartment or the CF card slot cover may be not properly indicating that the door is closed. If that's the case, you need to either return it to the place of purchase as defective, or send it in to Canon for warranty repair.

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I recommend that you remove both batteries for ten minutes to get a full reset. you spoke of the main battery. When you open the battery compartment, look at the lower right toward the camera with the LCD facing you.It is a little hard to see, but will say CR2016 3V. Stick your fingernail under the lip and just pull it out.As I said I left both batteries out for about 10 minutes.You will have to re-set the date and time after your done.

Try cleaning the contacts for the batteries with a pencil eraser. Make sure you hold the camera so the eraser debris falls OUT of the battery compartment as you clean. Also make sure the battery door latches properly, and that the batteries are correctly oriented.

The Display button manually turns the LCD display on or off to save batteries. If you accidentally had turned the LCD off, It should only take one press of the button to turn it back on and leave it that way. As such, it's not you but the camera. The A570 IS is relatively new. Your camera is likely still under warranty. If so, contact Canon for warranty repair (see the following link):